Method and furnace for treatment of ash
US5748666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | May 8, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/50
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and a d.c. arc furnace for thermal treatment of an ash, wherein reducing conditions are established within a closed and sealed furnace, the ash is supplied via a channel arranged in an electrode which extends towards a metal melt in a furnace shell and provides an arc extending toward the metal melt, the ash being fed from the open free end of the electrode through the arc, any slag and/or the metal melt, whereby the ash is rapidly heated under reducing conditions to a temperature of 1350.degree. C. to 1750.degree. C. such that PA1 any organic compounds contained in the ash are broken down, PA1 any inorganic salts contained in the ash are at least partially decomposed, PA1 any metals included in the ash are partially evaporated and partially integrated into the metal melt, PA1 the remaining part of the ash is integrated into the slag which after discharge is cooled to form a glass, PA1 any remaining harmful pollutants are dissolved in the glass and PA1 any gaseous pollutants which have escaped from the ash/slag are discharged and exhausted into a gas treatment plant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.